Where does “sizigio” come from?

sizigio (Esperanto) comes from Late Latin syzygia, from Ancient Greek συζυγία, from Ancient Greek σύζυγος, from Ancient Greek σῠν-, from Ancient Greek σύν, from Proto-Hellenic *ksún — beside, with.

sizigio (Esperanto): syzygy

Definitions

syzygy

Ancestry of “sizigio”, step by step

Step	Language	Word	Meaning
1	Late Latin	syzygia	conjunction; syzygy, conjunction
2	Ancient Greek	συζυγία	union, junction; yoke of animals; pair
3	Ancient Greek	σύζυγος	yoked together, paired; mate, yoked together
4	Ancient Greek	σῠν-	together; with, together
5	Ancient Greek	σύν	beside, with
6	Proto-Hellenic	*ksún	beside, with

Every word from Proto-Hellenic *ksún →Every word from Ancient Greek σῠν- →Every word from Ancient Greek σύν →